One is a parent dict, one is a child: you shouldn't have to look at the
source to tell which is which.
include/
* ctf-api.h (ctf_import): Name parameters.
extern const char *ctf_parent_name (ctf_dict_t *);
extern int ctf_type_isparent (const ctf_dict_t *, ctf_id_t);
extern int ctf_type_ischild (const ctf_dict_t *, ctf_id_t);
-extern int ctf_import (ctf_dict_t *, ctf_dict_t *);
+extern int ctf_import (ctf_dict_t *child, ctf_dict_t *parent);
/* Set these names (used when creating dicts). */